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Swamp Milkweed

The 5' tall plants produce interesting two-tone clusters of pink to purple blooms that have a light vanilla scent, are 2" across, and beloved by butterflies.  

40 seeds 




Asclepias incarnata 

Perennial, zones 3-9

Germination: 14-30 days, cold treating aids germination

Seed Planting Depth: Sow ⅛-¼” deep

Starting Indoors: Start indoors 8-10 weeks before the last frost. Cold treat the seed by sowing into moist soil or paper towel, wrap in a clear plastic bag, and place in the refrigerator for 2-3 weeks. Provide 65-75ºF soil temperatures until germination. Transplant new seedlings into individual biodegradable peat/cow pots/paper pots. This helps reduces root damage when transplanting. Transplant around the last frost date,12-18” apart.

Sowing Outdoors: Direct sow outdoors in early spring or early fall, spacing 3-5 seeds every 12". 

Spacing: 12-18”

Growth Habit:  Upright

Height and Width:  48-60” x 18-24"

Light Needs:  Full sun 

Soil Needs:  Average, moist to well-drained

Approximate days to flower from seed: Blooms in the second year. May bloom the first season when started early indoors, mid to late summer thereafter.

Uses: Wildflower and cottage gardens, low wet areas, cut flower, deer resistant, low maintenance, attracts butterflies and beneficials

Care: Water seedlings regularly until established. Amend the soil with compost before transplanting. Deadheading encourages a second bloom and reduces self-seeding. 

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  • Swamp Milkweed
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Jeffrey J.
United States United States
I recommend this product

Swamp Milkweed

I purchased Swamp Milkweed seeds earlier this summer and started them in flats outside. Practically all the seeds came up. Many have been planted but probably will not flower until next year but they a doing very well.

Phyllis S.

"Mystery Milkweed"

I call this "mystery milkweed" as it has very little information associated with the seed. I have started this plant from seed and have been very successful with germination (after cold stratification) and with seedlings. The plant description does not state if it is an annual or perennial nor does it give the botanical name. I did have it overwinter in my zone 5 garden this past year. I do love this plant and it has done well, but I would really love to know more about it.